Isotopes are elements with different numbers of neutrons. Isotopes do not effect chemistry…. Outside of unstable isotopes decaying into different elements, which will change chemical properties.
Hydrogen has 3 common isotopes, protium, deuterium, and tritium. In all cases it has 1 proton. Protium is 0 neutrons, deuterium is 1 neutron, and tritium is 2 neutrons. Chemically they all act as hydrogen. Tritium is unstable and one of the neutrons decays into a proton, emitting an electron. This changes it from hydrogen to helium.
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